Dapc general summarised_241106

Dynamic

Annular

Pressure

Control

@Balance

© 2006 At Balance Americas LLC All Rights Reserved

Dynamic Annular Pressure Control

Reduce effects of overbalance

� TD in ERD wells

� TD in depleted fields

� Reservoir damage

� Reservoir productivity

� Hole breathing & well influx

� Hole cleaning

� Drill rate

� Mud loss

� Stuck pipe

Reduce effects of overbalance

� TD in ERD wells

� TD in depleted fields

� Reservoir damage

� Reservoir productivity

� Hole breathing & well influx

� Hole cleaning

� Drill rate

� Mud loss

� Stuck pipe

Manage BHP at or near balance and overcome

limitations of drilling with overbalanced mud in:

���� Growing number of aging fields

���� Hostile pressure environments

���� Fields conventionally undrillable

Initial

Concept:

© 2006 At Balance Americas LLC All Rights Reserved

Engineered Pressure Window

0Pressure

Depth

Casing Point

BELOW MINIMUM

• Kicks

• Borehole Stability

• Swap Out

ABOVE MAXIMUM

• Mud Losses

• Ballooning

• Stuck Pipe

• Reduced ROP

• Formation Damage

• Poor Hole Cleaning

© 2006 At Balance Americas LLC All Rights Reserved

Pdynamic +Psurface

Conventional VS DAPC

Pressure

TV D

epth

0

Conventional

Pdynamic (= Pmax)

Pstatic (= Pres)

DAPC

Pstatic

Static Surface Back Pressure

Pstatic + Psurface

Pressure

Window

Casing

Reduce With Pumps On

Pressure at Surface

with DAPC

Down hole with

conventional

Set point

pressure

© 2006 At Balance Americas LLC All Rights Reserved

DAPC Automated System

• Well Head Pressure

• Downhole PWD

• Flow Rate

• String RPM

• Drilling ROP

• Drilling WOB

• Well Geometry

• Drill String Geometry

• Well Head Pressure

• Downhole PWD

• Flow Rate

• String RPM

• Drilling ROP

• Drilling WOB

• Well Geometry

• Drill String Geometry

Back Pressure PumpBack Pressure PumpBack Pressure Pump Automated Dual ChokeAutomated Dual ChokeAutomated Dual Choke

Hydraulics ModelHydraulics ModelHydraulics Model

Remote MonitoringRemote MonitoringRemote Monitoring

Programmable ControllerProgrammable ControllerProgrammable Controller

Graphical User

Interface

Graphical User Graphical User

InterfaceInterface

Data NetworkData NetworkData Network

© 2006 At Balance Americas LLC All Rights Reserved

Piping & Instrumentation Drawing

© 2006 At Balance Americas LLC All Rights Reserved

DAPC Automated Backpressure

The Only MPD Solution with

Standalone Automated Backpressure Pump

The Only MPD Solution with

Standalone Automated Backpressure Pump

Backpressure Pump

� Modular / Stand-alone

� Automatic start

� Electric motor drive

� Applies pressure when

rig pumps are off or

down

Backpressure Pump

� Modular / Stand-alone

� Automatic start

� Electric motor drive

� Applies pressure when

rig pumps are off or

down

© 2006 At Balance Americas LLC All Rights Reserved

DAPC – “PROVEN TECHNOLOGY”

• Hydraulics Model – developed by Shell

� Proven technology that can operate in any

environment and maintain a BH pressure window

� R&D started in 1998

• Backpressure Pump that maintains BHP

during any rig pump variations

• PROVEN - Fully automated control system

� Allows automated response to changing Down

Hole conditions

© 2006 At Balance Americas LLC All Rights Reserved

Other Applications with DAPC

• Value of DAPC with Underbalanced Drilling

� Hold backpressure with DAPC to:

– Reduce produced well fluids

– Reduce footprint (separator, tanks)

– Reduces manpower from UBD crew

� Improved reservoir characterization

� Enhanced Safety Controls

� Stabilize SluggingBottom hole pressure [kPa]

BHP without control [kPa]

BHP pressure with control [kPa]

kPa

9000

8000

7000

6000

5000

4000

3000

Time [h]

43.532.521.510.50.2

© 2006 At Balance Americas LLC All Rights Reserved

Formation Damage

▼ Reduce Formation Damage

▲ Increase Productivity with less Formation Damage

Drilling Performance

▲ Improve Hole Cleaning

▲ Increase ROP

▼ Reduce Mud Costs

Risk Management

▼ Reduce Risk of losses, well control, Sidetracks, stuck pipe,

lost circulation – Reduction of NPT

▼ Reduce NPT from Green Drilling Crews

▼ Reduce Casing Strings

Value Drivers of TRUE BHP Control

© 2006 At Balance Americas LLC All Rights Reserved

QUESTIONS?